/**
 * Copyright (C) 2010 David Simonek <dafesimonek@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package org.dafe.partyband.db.impl.queries;

import com.db4o.ObjectContainer;
import com.db4o.ObjectSet;
import com.db4o.query.Predicate;
import java.util.List;
import org.dafe.partyband.db.api.IAuthor;
import org.dafe.partyband.db.api.queries.IAuthorQuery;

/**
 *
 * @author dafe
 */
public class AuthorQuery extends Predicate<IAuthor> implements IAuthorQuery {

    private ObjectContainer db;
    ThreadLocal<String> name2Find = new ThreadLocal<String>();

    public AuthorQuery(ObjectContainer db) {
        this.db = db;
    }

    public List<? extends IAuthor> getAllAuthors() {
        return db.query(IAuthor.class);
    }

    public IAuthor findAuthor(String name) {
        name2Find.set(name);
        ObjectSet<IAuthor> result = db.query(this);
        return result.isEmpty() ? null : result.get(0);
    }

    @Override
    public boolean match(IAuthor candidate) {
        // TBD - use encoder or not?
        return name2Find.get().equals(candidate.getName());
    }

    public void setObjectContainer(ObjectContainer db) {
        this.db = db;
    }

}
